The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2012
Filed:
Sep. 14, 2009
Xuetao MI, Guangdong, CN;
Qingfeng Guo, Guangdong, CN;
Min Xu, Guangdong, CN;
Gree Electric Appliances, Inc. of Zhuhai, Zhuhai, Guangdong, CN;
Abstract
A one cycle control method for power factor correction based on a boost circuit and a main control chip of system comprises the steps of: () Determining whether soft-start ends or not; if the soft-start ends, processing step () directly, if not, increasing reference value Uof output voltage and then processing step (); () Reading sampling output voltage U, and sampling inductive current iaccording to A/D sampling triggering instant; () Calculating duty ratio of PWM signal for driving the switch transistor; () Outputting PWM signal; () Calculating the next A/D sampling triggering instant according to the duty ratio of PWM signal; () Returning to step (). The present invention can implement the function of power factor correction by integrating the software of the method into the main control chip of the existing system and cooperating with the simple boost circuit, without using the traditional circuit for power factor correction and the specific one cycle control chip for PFC, which reduces the cost of the system. Also the present invention ensures the sampling data true and correct, and the stable operation of system, by simple processing of the sampling triggering instant.